Heat Hi I own a 98 f150 4.2 ltr and l all of a sudden have no heat ... the fan seems to be working but nothing is coming out any of the vents or defrost ... thank you Kool in Canada

Direction flow door motor stuck or bad

replace the switch its self.. you can search ebay motors under electrical and find one easily.. also they remove easily and just plug in the back..

does the car have automatic climate control?

usually a faulty blend door under the dash

check to see if your fan is working. feel for it working out of the vent, defroster, and floor mode. if nothing then check to see if the fuse is blown for the fan blower motor. if that is good then you will need to check for power at the fan itself. if you have power ther then the fan is bad if not you may have a problem with the switch or wiring. don't overlook the odvious and check to see if you have a cabin air filter that is plugged up, that can cause it too.

Sounds like the switch,I have had the same happen. Won't work on 1or2 but 3-4 worked fine. The next day 1-2 worked....? With out a meter to check it will be guess work.

Look up in the vents with a flashlight, some times an errent object placed on the dash finds its way down the defroster vent and into the plenum. These items tend to keep the doors that dirrect the air from moving.

With the engine off, radio too, turn the key on and try the heater fan on all speeds. No fan, check the fuses. Fan is ok, check the coolant level, if thats fine, then check for a mouse nest in the duct work. Frankster016